Class 3 Maths Worksheet: Addition and Subtraction

Maths worksheets lesson 17: 3-digit addition and subtraction · Set 781 · 40 sums

The method (Column by column): Line up ones, tens and hundreds. Add from the right; 10 or more → carry 1 to the next column. Subtract from the right; top digit smaller → borrow 1 from the next column. Missing number in an addition = total − the number you know.

1. 1.237 − 205 =
2. 2.654 − 221 =
3. 3.A train has 173 people in the front coaches and 372 people in the back coaches. How many people are on the train?
4. 4.176 + 109 =
5. 5.100 + 177 =
6. 6.A school has 556 children. 116 of them are girls. How many boys are there?
7. 7.? − 242 = 533
8. 8.765 + ? = 995
9. 9.A school has 381 children. 273 of them are girls. How many boys are there?
10. 10.A train has 181 people in the front coaches and 478 people in the back coaches. How many people are on the train?
11. 11.696 + ? = 902
12. 12.629 + 182 =
13. 13.703 + 281 =
14. 14.A train has 490 people in the front coaches and 405 people in the back coaches. How many people are on the train?
15. 15.292 − ? = 23
16. 16.657 + ? = 918
17. 17.? − 593 = 19
18. 18.413 − 335 =
19. 19.378 − 207 =
20. 20.A school has 714 children. 340 of them are girls. How many boys are there?
21. 21.698 − ? = 585
22. 22.672 + ? = 777
23. 23.A train has 194 people in the front coaches and 631 people in the back coaches. How many people are on the train?
24. 24.? + 740 = 901
25. 25.155 + ? = 549
26. 26.372 + 611 =
27. 27.A school has 779 children. 273 of them are girls. How many boys are there?
28. 28.? + 564 = 785
29. 29.246 − ? = 28
30. 30.? + 649 = 797
31. 31.286 + 658 =
32. 32.532 − 245 =
33. 33.676 − ? = 109
34. 34.993 − ? = 407
35. 35.839 − ? = 37
36. 36.332 + 406 =
37. 37.505 + 304 =
38. 38.783 − 371 =
39. 39.A school has 785 children. 715 of them are girls. How many boys are there?
40. 40.518 − 107 =

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